tempstar furnaces ????????
Comments
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Temp rise is within range but what is the actual supply air temperature?
What are the combustion numbers, specifically flue temperature?
Natural or LP gas? What's the manifold gas pressure?
I did a conversion kit on a Rheem furnace today. I had 19.36" wc when it first fired. I backed it out to 10" right quick.
When you say "coil", I assume you mean evaporator. How much space is there between the top of the coil and the top of the supply duct? Was A/C there before?
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Are you measuring your static in the right locations. Feels like the motor might be tripping out to protect itself but its happening in midcycle and its showing up as a high limit. did you measure supply and return static and add them together? what size is the supply. set the dip switch for 1400 cfm's.0
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To hvacnut its natural gas , i did not take gas pressure i will when i go back but we did a replacement and previous furnace worked so i didnt go down that route as for actual supply plenium temp. it was 141F.(delta t 56f) its a 95% furnace but i did not take flue temp. maybe i should. but flame looks good, its not lazy ,pulling nicely into burner tubes nothing that i would suspect flue issue. we did not change or alter, the pressure switch is pulling well i tested with manometer.....as for PEDMEC yes i did static in right place in return of furnace after filter and between coil (evaporator) and furnace. The coil is a direct fit right on top of furnace ,standard install . i waas told by a few of my friends that tempstar is very sensitive and trips very easy . i verified it was the high limit going off !00%. the high limit is cut out 170f and cut in 20f... i was told other furnaces are usually higher. one thing i did do is take out high limit and measure temperature with my prob. and got 124F which i found odd especially that limit is set for 170F. thinking about adding more return its up for debate just want to check everything else before i spend more money on a job that was complete if i dont have to . also wondering if anyone else has had issues with tempstar furnaces0
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I’ve had furnaces (including the one that was in my house) that had the disc limit switch located too close to the wall of the heat exchanger. Bending the metal arms that hold the switch fixed the problem.Bob Boan
You can choose to do what you want, but you cannot choose the consequences.1 -
Supply plenum was 141°F ?John732 said:To hvacnut its natural gas , i did not take gas pressure i will when i go back but we did a replacement and previous furnace worked so i didnt go down that route as for actual supply plenium temp. it was 141F.(delta t 56f) its a 95% furnace but i did not take flue temp. maybe i should. but flame looks good, its not lazy ,pulling nicely into burner tubes nothing that i would suspect flue issue. we did not change or alter, the pressure switch is pulling well i tested with manometer.....as for PEDMEC yes i did static in right place in return of furnace after filter and between coil (evaporator) and furnace. The coil is a direct fit right on top of furnace ,standard install . i waas told by a few of my friends that tempstar is very sensitive and trips very easy . i verified it was the high limit going off !00%. the high limit is cut out 170f and cut in 20f... i was told other furnaces are usually higher. one thing i did do is take out high limit and measure temperature with my prob. and got 124F which i found odd especially that limit is set for 170F. thinking about adding more return its up for debate just want to check everything else before i spend more money on a job that was complete if i dont have to . also wondering if anyone else has had issues with tempstar furnaces
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It isn't one of those limits mounted on a standoff in the airflow with a piece of foil flapping around and shorting out the limit, is it?0
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If the supply temp was 141, and the return temp is 70, then that’s a 71* temp rise, not 56*.If you actually had a 56* rise with a 141* supply, the return temp would have had to be 85*. Who keeps a house that hot?Bob Boan
You can choose to do what you want, but you cannot choose the consequences.
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I had the foil flopping short out the high limit on a furnace years ago.
But it cooked the power transformer as there was no low voltage fuse.0 -
IRONMAN....well since we were doing testing and running , my limit kept tripping about 12 minutes , until i pin pointed the limit was opening , at first i thought it was flue issue . so every time the supply went up so did return so yeah my return was 85 .i thought that was weird but that's what thermometer said and returns are on side wall but high near ceiling, it got that way as we keep turning up stat so we could try to run unit to see which limit was tripping. but it basically maintain 56 - 55 td . after changing high limit its not doing any more. so i believe we stopped the cycling. new unit with faulty high limit rare but i was just wondering if that was tempstar issues ?0
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@John732
If you measured the discharge temp when stabilized at 141 and the limit is a 170 then obviously the limit is bad. 170 seems low for a limit but it shouldn't get that high anyhow. When your down to a normal return temp you should be around 1260 -
Thats a very High return temperature. Not a normal operating range.John732 said:IRONMAN....well since we were doing testing and running , my limit kept tripping about 12 minutes , until i pin pointed the limit was opening , at first i thought it was flue issue . so every time the supply went up so did return so yeah my return was 85 .i thought that was weird but that's what thermometer said and returns are on side wall but high near ceiling, it got that way as we keep turning up stat so we could try to run unit to see which limit was tripping. but it basically maintain 56 - 55 td . after changing high limit its not doing any more. so i believe we stopped the cycling. new unit with faulty high limit rare but i was just wondering if that was tempstar issues ?
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